<?xml version="1.0"?>
<!DOCTYPE graph SYSTEM "http://www.cs.rpi.edu/~puninj/XGMML/xgmml.dtd">
<graph directed="1">
<node id="1" label="n1">
<att>
<graph directed="1">
<node id="11" label="n11"/>       
<node id="12" label="n12"/>       
<edge source="11" target="12" weight="0"/>
</graph>
</att>
</node>
<node id="2" label="n2">
<att>
<graph directed="1">
<node id="21" label="n21"/>       
<node id="22" label="n22"/>       
<edge source="22" target="21" weight="0"/>
<edge source="21" target="22" weight="0"/>
</graph>
</att>
</node>
<edge source="11" target="21" weight="0"/>
<edge source="12" target="22" weight="0"/>
<edge source="21" target="11" weight="0"/>
<edge source="22" target="11" weight="0"/>
<edge source="22" target="12" weight="0"/>
</graph>

